[Bug 76892] [hsw] full debugging leads to long delays between TearFree updates due to an overloaded GPU!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76892

--- Comment #47 from Andreas Reis <andreas.reis at gmail.com> ---
Created attachment 96905
  --> https://bugs.freedesktop.org/attachment.cgi?id=96905&action=edit
Xorg.0.log at 564e4a98

Anyway, the final Xorg.0.log.

But: Commit "sna/gen2+: Replace composite sources with solids where possible"
causes the xserver to instantly crash when starting certain programs (noticed
it with Chromium, pinta, and gimp):

Program received signal SIGSEGV, Segmentation fault.
0x00007f5dd78696e3 in gen7_composite_picture () from
/usr/lib/xorg/modules/drivers/intel_drv.so
(gdb) bt
#0  0x00007f5dd78696e3 in gen7_composite_picture () from
/usr/lib/xorg/modules/drivers/intel_drv.so
#1  0x00007f5dd786f78d in gen7_render_composite () from
/usr/lib/xorg/modules/drivers/intel_drv.so
#2  0x00007f5dd77cf9ed in sna_composite () from
/usr/lib/xorg/modules/drivers/intel_drv.so
#3  0x0000000000543f9d in damageComposite ()
#4  0x0000000000537f6a in ProcRenderComposite ()
#5  0x0000000000438456 in Dispatch ()
#6  0x000000000043cdd5 in dix_main ()
#7  0x00007f5ddc9ddb05 in __libc_start_main () from /usr/lib/libc.so.6
#8  0x000000000042510e in _start ()

BT was taken at git-head, ie. "Move constants MOCS", then I "bisected" to find
which of the three new commits was the cause.

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